A flaw was found in all Samba versions before 4.10.17, before 4.11.11 and before 4.12.4 in the way it processed NetBios over TCP/IP. This flaw allows a remote attacker could to cause the Samba server to consume excessive CPU use, resulting in a denial of service. This highest threat from this vulnerability is to system availability.
https://www.samba.org/samba/security/CVE-2020-10745.html
https://security.gentoo.org/glsa/202007-15
https://lists.debian.org/debian-lts-announce/2020/11/msg00041.html
https://bugzilla.redhat.com/show_bug.cgi?id=1849491%3B
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00002.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00054.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00030.html